Classes, Mappings and Persist for Adaptivity

[niklasstich]

Closes #340

• Implemented Entity classes
• Implemented PersistEntity classes
• Implemented ViewModel classes
• Implemented mapping between ViewModel and Entity
• Implemented mapping between Entity and PersistEntity
• Implemented DataContracts on PersistEntity classes

[coveralls]

Pull Request Test Coverage Report for Build 6199387597

• 702 of 1029 (68.22%) changed or added relevant lines in 39 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-2.0%) to 87.18%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Presentation/PresentationLogic/LearningContent/AdaptivityContent/Action/ContentReferenceActionViewModel.cs	11	12	91.67%
Presentation/PresentationLogic/LearningContent/AdaptivityContent/Action/ElementReferenceActionViewModel.cs	5	10	50.0%
Presentation/PresentationLogic/LearningContent/AdaptivityContent/Trigger/CompositeTriggerViewModel.cs	6	12	50.0%
PersistEntities/LearningContent/AdaptivityContent/Trigger/TimeTriggerPe.cs	0	10	0.0%
PersistEntities/LearningContent/AdaptivityContent/Trigger/CompositeTriggerPe.cs	0	12	0.0%
BusinessLogic/Entities/LearningContent/AdaptivityContent/Trigger/CorrectnessTrigger.cs	15	28	53.57%
PersistEntities/LearningContent/AdaptivityContent/Action/ElementReferenceActionPe.cs	0	13	0.0%
BusinessLogic/Entities/LearningContent/AdaptivityContent/Question/Choice.cs	15	30	50.0%
PersistEntities/LearningContent/AdaptivityContent/Action/ContentReferenceActionPe.cs	0	15	0.0%
BusinessLogic/Entities/LearningContent/AdaptivityContent/Action/CommentAction.cs	14	30	46.67%
<!--	Total:	702	1029	68.22%	-->

Totals
Change from base Build 6186051437:	-2.0%
Covered Lines:	9643
Relevant Lines:	11061

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💛 - Coveralls